What is the best sidekick model?

[Jonathan]

I was thinking iPhone because I could unlock it and get a t Mobile chip but then I saw t mobiles sidekick plan it's pretty epic so I decided to get a sidekick and use that plan instead but now comes the real problem... Which sidekick is the best and and doesn't cost that much I can afford a phone but not a freakin 2010 model brand new. You know what I mean so which model would you recommend as the best